Hammermill rotor including paired



2,810,529 HAMMERMILL ROTOR INCLUDING PAIRED DIVERGENT-END HAMMERS s. c. JENSEN Oct. 22, 1957 Original Filed May 9, 1952 wjn INVENTOR. I

United States Patent Cfilice HAMMERMILL ROTOR INCLUDING rAnmn DIVERGENT-END HAMMERS Sanning C. Jensen, Neola, Iowa Continuation of application Serial No. 287,010, May 9, 1952. This application October 17, 1956, Serial No. 616,572 I 2 Claims. (Cl. 241-194) This invention relates to hammermills and more particularly it is an object of this invention to provide a hammermill assembly the tips of the knives of which are spread apart.

It has been the practice for grain hammermill knives to be disposed against each other in side by side parallelism. -This construction makes it impossible for the assembly having twosets of knives, each set comprising two or more knivesfthe knives of each set being disposed in parallelism, and the outer ends of the knives of each set being divergently disposed with respect to the outer ends of the knives of the other setfor widely .30 Another object of the invention is to provide a knife Other embodiments of the invention utilizing the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

This application is a continuation of the applicants co-pending patent application'Serial No. 287,010, filed May 9, 1952, now abandoned.

In the drawings:

Figure 1 is a top plan View of a section of a grain hammermill showing a portion of a housing thereof, a portion of the rotor shaft, half portions of two outwardly extending discs, and an end portion of the hammerpin, a knife assembly of this invention having two knives and an adapter for use therewith are shown on the hammer- Figure 2 is a top plan view of a portion of a grain hammermill also showing a housing portion, a portion of the rotor shaft, two spaced apart discs, a hammerpin, a larger adapter than in Figure 1, and a knife assembly comprising four knives arranged in two sets;

Figure 3 is an enlarged view of an end of one of the knives of Figure 1' showing the manner in which the knife wears away to form sharp cutting edges;

Figure 4 is a view similar to Figure 3 butof the tips of a pair of knives of one set as shown in Figure 2; and

Figure 5 is a view-in-section of a knife as seen in Figure 3 with the upper portion thereof removed.

In grain hammermills a rotor is provided such as is generally indicated at 10. Such rotors are disposed inside L housings and a portion of the housing is indicated M12 spacing apart the tip ends of the knives of one set with ing each assembly in place.

Still another object of the invention is to provide knife I assemblies of the type' described, the outer sides of which are hardened whereby they wear away less quickly than '45 the portions of the knives between the hardened sides whereby the wearing away of the softer center portions of the knives cause the harder outer surfaces to protrude for providing sharp cutting surfaces. I

It is another object to provide as an article of manufacture a knife for grain hammermill knives having an outer section bent at an angle with'respect to the inner section.

It is a furtherobject to provide as an article of manufacture a knife for a hammermill having an outer section bent with respect to the inner section and further having a construction such that the outer side surfaces of the knives are hardened and the center section of the knives is left softer whereby the hardened surfaces tend to form sharpcuttingedges as the inner section Wears away in user Yet another object of the invention is to provide a de vice for the purpose described which is sturdy and durable in construction, reliable and efiicient in operation, and relatively simple and inexpensive to manufacture, assemble and utilize.

Other and further objects and advantages of the present invention will be apparent from the following detailed description, drawings and claims, the scope of the invention not being limited to the drawings themselves as the drawings are only for the purpose of illustrating a way in which the principles of this invention can be applied.

knife assemblies in combination with an adapter for -hold having a bolt 14 therethrough. The rotor has a center rotor -shaft-16and hammerpin holding members or discs 20 extend radially outwardly from the rotor shaft 10 and support a hammerpin 24 which is disposed through apertures in the outer end of the discs 20 and is held in place by a nut 26 at one of its ends.

. indicated at 30. The hammers or knives 30 have inner end sections 32 disposed in parallelism with each other extending substantially radially outwardly from the ham- 1 merpin 24.

end section which extends outwardly at an inclination with respect to its respective inner section 32. The outer end sections 40 of the two knives extend divergently outwardly with respect to each other whereby the outer ends of the knives 40 are widely spaced apart with respect to each other in directions spaced along the axis of the rotor 10 with respective inner sections 32.

An adapter is provided for holding the knives 30 in place. The adapter 50 is formed of resilient material and extends about the inner ends of the knife 30. The adapter 50 has two outwardly extending arms pressing against the sides of the knives 30 to hold the inner ends of the hammers together. each have an aperture therethrough for receiving the section 24. I

In Figure 2 a modification of the invention is seen which is similar in most respects to the modification of Figure 1. In Figure 2 the housing portion shown is given the numeral 50 and the bolt shown is numbered 52. In Figure 2 the rotor is generally indicated at 10 and the rotor shaft is shown at 16. Two discs are shown more widely spaced apart than the discs 20 of Figure 1. A hammerpin 24 is disposed through the discs 60 and has a head 62.

Upon the hammerpin 24 four knives generally indicated at are arranged. The knives 70 are arranged in two P a tented Oct. 22, 1957 The arms of the adapter 50 VI-(2,810,529 e etsnfctnc, .Thetuekai resraf.eachssetarmrraqsed n parallelism with one another and are disposed along- The knives of the two sets have their :ide one another.

-iauersudsheias.adac ecltcs idretensai a mer ea h ire.:divcrge lyadisposedwwith espec s 16611011 78 of the knives of;,the ;oth e r;- set.

Theouter end sections 76-o f; the, oneisetofgknives are lisposed in climbing outwardly; w i th'respeebto the inner :ections of the knives of the same set. The outer end :ections of the knives of each set incline outwardly vin lirections spaced along the ;,ax is ofthe rotorflfl with respect .to' the respectiverinnerend sections oi the, respective rnives, ,With; the ;outer endsectionsof the kniyesof one ct .in l nedly d spose o w rdly th spec to th mi f1 h oth se w e hrth tip nd o th sn re f.difie entse a w de y-sp c ap sections of the hammers of the other set whereby the tip ends of the hammers of different setsare Widely spaced aapart; and an adapterformed of resilient materiahextend- As thus described, it will be seen that the knives a )f Figure 'Land each set ofkniyes of Figure 2 are-spaced ipartat-their outerends wherebygrain can get between he tips and canflow ontothe face or front of tips of he knives more efficiently and for more efiicient cutting action.

Referring to, Figure 3, itwill be seen that the-outer tip 1f eachknife-40 isprovided with-hardened outer surfaces 30 which latter tend to wear away into sharp cutting :dges 82. The hardened outer surfacessfl wear away ess quickly than the softer center portion 84 of the hives-whereby the hardened outer edges 80 are exposed for cutting.

.In Figure 4' two of the knives 70 of Figure 2 are shown with hardened outer surfaces 90, sharp edges 92 and soft :enters 94.

-In FigureS a magnified view of the outer-tip ofthe rnife of Figure. 3 is shown in cross section to more fully llustrate the construction.

.From the foregoing description, it is though to be )bvious that a hammermill rotor including paired divergent-end hammers constructed in accordance with my invention is particularly well adapted for use, by reason at the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of some changeand modifica- Lion without departing from the principles and spirit thereof, and for this reason I do not wishtobe understood as limiting myself to the precise arrangement :and formation of the several parts herein shown in carrying out; my invention in practice, except as claimed.

c a m:

l. *In a hammermill: ,a rotor; two hammerpin holding nembers attached to and outstanding radiallyfro m said rotor, said holding members being spaced apart lengthwise of the axis of said rotor and having-alignedgapertures therethrough, said apertures being arraqgfid on .a line which latter is disposed in parallelism with and spaced from the axis of said rotor; a hammerpin. disposed through said apertures in said holding members; a hammer assembly comprising two sets of hammers, each set having at least two hammers, the hammers of each set being in parallelism with each other and disposed alongside each other along the lengths thereof, said hammers having inner end sections disposed alongside each other and disposed extending substantially radially outward, said ing around the inner ends of said hammers and having two outwardly extending.-arms,pressing,.against the sides of said hammers to hold the inner ends of said hammers together, said adapter arms each having an aperture therethrough receiving said hammerpin;

.2. 'In a hammermill: a rotor having two. outstanding radially disposed parallel spaced apa rt hammerpin holding members having aligned apertures therethrough, said apertures being'arranged on aline which latter is disposed in-parallelism with andispaced-from theaxis of said rotor, a hammerpin disposed through-said apertures, a hammer assembly comprising two hammers, said hammers each having inner end sections disposed alongside each other and disposed substantially radially outward with respect to said rotor, the inner end sections of each hammer having an aperture therethrough receiving said hammerpimsaidhammers each having an outer end section inclinedly disposed in respectto theinnersection of the respectivehamrner, the outerendsection of each harnrner being disposed inclining outwardly at an obtuse angle with respect to-the inner end thereof and said outer end being; in a position spaced along the axis of said rotor with respect to the respective inner end section, the outer end section of each hammer inclining divergently out- -wardly with respectto the outer end sectionof the other hammer whereby the tip ends of each hammer are wide? ly'spaced apart,.and an adapter formed OfrIE-Silifillt material extending around the inner end sections of said hammers andhaving'two outwardly extending armspressing against those sides of the innerend sections of-each of said hammers which are disposed'away from the other hammer respectivelyto; press the said inner-end sections f d me ;t ar each-ethe sa adap ar ac h v ae an a e ture heret qnsh rereiv s s id 11a .merpin.

ReferencesCitedin the file of this patent Germany July 19, 19.30

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